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https://www.readbyqxmd.com/read/29245182/an-efficient-parallel-simulation-of-unsteady-blood-flows-in-patient-specific-pulmonary-artery
#1
Fande Kong, Vitaly Kheyfets, Ender Finol, Xiao-Chuan Cai
Simulation of blood flows in the pulmonary artery provides some insight into certain diseases by examining the relationship between some continuum metrics, e.g. the wall shear stress acting on the vascular endothelium, which responds to flow-induced mechanical forces by releasing vasodilators/constrictors. In [?kheyfets2015patient], V. Kheyfets studies numerically a patient-specific pulmonary circulation to show that decreasing wall shear stress is correlated with increasing pulmonary vascular impedance. In this paper, we develop a scalable parallel algorithm based on domain decomposition methods to investigate an unsteady model with patient specific pulsatile waveforms as the inlet boundary condition...
December 15, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/29245145/comparative-leaching-of-six-toxic-metals-from-raw-and-chemically-stabilized-mswi-fly-ash-using-citric-acid
#2
Huawei Wang, Xinxiu Fan, Ya-Nan Wang, Weihua Li, Yingjie Sun, Meili Zhan, Guizhi Wu
The leaching behavior of six typical toxic metals (Pb, Zn, Cr, Cd, Cu and Ni) from raw and chemically stabilized (phosphate and chelating agent) municipal solid waste incineration (MSWI) fly ash were investigated using citric acid. Leaching tests indicated that phosphate stabilization can effectively decrease the leaching of Zn, Cd and Cr; whereas chelating agent stabilization shows a strong ability to lower the release of Pb, Cd and Cu, but instead increases the solubility of Zn and Cr at low pH conditions...
December 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29245136/small-maf-functions-in-the-maintenance-of-germline-stem-cells-in-the-drosophila-testis
#3
Sharon Wui Sing Tan, George W Yip, Toshio Suda, Gyeong Hun Baeg
Reactive oxygen species (ROS) are byproducts generated during normal cellular metabolism, and redox states have been shown to influence stem cell self-renewal and lineage commitment across phyla. However, the downstream effectors of ROS signaling that control stem cell behavior remain largely unexplored. Here, we used the Drosophila testis as an in vivo model to identify ROS-induced effectors that are involved in the differentiation process of germline stem cells (GSCs). In the Affymetrix microarray analysis, 152 genes were either upregulated or downregulated during GSC differentiation induced by elevated levels of ROS, and a follow-up validation of the gene expression by qRT-PCR showed a Spearman's rho of 0...
December 8, 2017: Redox Biology
https://www.readbyqxmd.com/read/29245108/learning-and-transfer-of-working-memory-gating-policies
#4
Apoorva Bhandari, David Badre
knowledge about the tasks we encounter enables us to rapidly and flexibly adapt to novel task contexts. Previous research has focused primarily on abstract rules that leverage shared structure in stimulus-response (S-R) mappings as the basis of such task knowledge. Here we provide evidence that working memory (WM) gating policies - a type of control policy required for internal control of WM during a task - constitute a form of abstract task knowledge that can be transferred across contexts. In two experiments, we report specific evidence for the transfer of selective WM gating policies across changes of task context...
December 12, 2017: Cognition
https://www.readbyqxmd.com/read/29245090/psychological-distress-and-risk-for-suicidal-behavior-among-university-students-in-contemporary-china
#5
Fang Tang, Majella Byrne, Ping Qin
BACKGROUND: Psychological distress and suicidal behavior are important mental health problems among university students and warrant research to inform strategies for effective prevention in this young population. The present study aimed to assess psychological distress and suicidal behavior and to unravel their associations among university students. METHODS: A total of 5972 undergraduate students, randomly selected from six universities in central China, comprised the sample...
December 6, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29245081/safety-in-stigmatizing-instrumental-stigma-beliefs-and-protective-sexual-behavior-in-sub-saharan-africa
#6
David A Cort, Hsin Fei Tu
How are people's expression of HIV stigma beliefs connected to their own personal decisions concerning safe sexual practices? Does this relationship vary across countries and by the national context in which people reside? To answer these questions, we develop and test individual, contextual, and cross-level interactional hypotheses of the impact of instrumental HIV stigma attitudes on several measures of protective sexual behavior. Using Demographic and Health Survey data from 467,656 unpartnered individuals across 34 sub-Saharan African countries, we first find that counterintuitively, conservative HIV stigma attitudes are associated with lower likelihoods of participating in all types of protective sexual behaviors...
December 9, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/29245074/fabrication-characterization-and-photoelectrochemical-activity-of-tungsten-copper-co-sensitized-tio2-nanotube-composite-photoanodes
#7
Mohamad Mohsen Momeni, Yousef Ghayeb, Farzaneh Ezati
Tungsten-copper co-sensitized TiO2 nanotube films on titanium substrate, used as photoanodes in photoelectrochemical (PEC) water splitting to produce hydrogen, have been synthesized via anodization and chemical bath deposition (CBD) methods. Field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) were used to study the morphology and elemental composition of the synthetic samples. UV-Vis diffuse reflection spectroscopy (UV-Vis DRS) was sued to investigate the optical features of the samples...
December 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29245062/comparative-studies-on-dna-binding-and-in-vitro-antitumor-activity-of-enantiomeric-ruthenium-ii-complexes
#8
Wen-Xu Hong, Fengwen Huang, Tianwen Huan, Xu Xu, Qingguo Han, Gaofeng Wang, Hong Xu, Shan Duan, Yongheng Duan, Xun Long, Ying Liu, Zhangli Hu
A pair of ruthenium(II) complex enantiomers, Δ- and Λ-[Ru(bpy)2PBIP]2+ {bpy=2,2'-bipyridine, PBIP=2-(4-bromophenyl)imidazo[4,5-f]1,10-phenanthroline} have been synthesized and characterized. The systematic comparative studies between two enantiomers on their DNA binding-behaviors with calf thymus DNA (CT DNA) were carried out by viscosity measurements, spectrophotometric methods and molecular simulation technology. Additional assays were performed to explore the cytotoxicity of the ruthenium(II) enantiomers against tumor cell lines...
November 29, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29245045/relations-between-problem-behaviors-perceived-symptom-severity-and-parenting-in-adolescents-and-emerging-adults-with-asd-the-mediating-role-of-parental-psychological-need-frustration
#9
Lisa M Dieleman, Sarah S W De Pauw, Bart Soenens, Elien Mabbe, Rachel Campbell, Peter Prinzie
Research in parents of youngsters with Autism Spectrum Disorder (ASD) increasingly documents associations between children's problem behaviors and symptom severity and more dysfunctional and less adaptive parenting behaviors. However, the mechanisms underlying these associations have not been examined thoroughly. This study examines the mediating role of parental need frustration in the relation between child maladjustment (i.e., problem behavior and autism severity) and parenting behavior (i.e., controlling and autonomy-supportive parenting)...
December 12, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/29245042/is-the-diagnostic-threshold-for-bulimia-nervosa-clinically-meaningful
#10
Danielle A N Chapa, Brittany K Bohrer, Kelsie T Forbush
The DSM-5 differentiates full- and sub-threshold bulimia nervosa (BN) according to average weekly frequencies of binge eating and inappropriate compensatory behaviors. This study was the first to evaluate the modified frequency criterion for BN published in the DSM-5. The purpose of this study was to test whether community-recruited adults (N=125; 83.2% women) with current full-threshold (n=77) or sub-threshold BN (n=48) differed in comorbid psychopathology and eating disorder (ED) illness duration, symptom severity, and clinical impairment...
December 8, 2017: Eating Behaviors
https://www.readbyqxmd.com/read/29245038/spatiotemporal-influence-of-temperature-air-quality-and-urban-environment-on-cause-specific-mortality-during-hazy-days
#11
Hung Chak Ho, Man Sing Wong, Lin Yang, Wenzhong Shi, Jinxin Yang, Muhammad Bilal, Ta-Chien Chan
Haze is an extreme weather event that can severely increase air pollution exposure, resulting in higher burdens on human health. Few studies have explored the health effects of haze, and none have investigated the spatiotemporal interaction between temperature, air quality and urban environment that may exacerbate the adverse health effects of haze. We investigated the spatiotemporal pattern of haze effects and explored the additional effects of temperature, air pollution and urban environment on the short-term mortality risk during hazy days...
December 12, 2017: Environment International
https://www.readbyqxmd.com/read/29245024/early-onset-tobacco-use-and-suicide-related-behavior-a-prospective-study-from-adolescence-to-young-adulthood
#12
Tellervo Korhonen, Elina Sihvola, Antti Latvala, Danielle M Dick, Lea Pulkkinen, John Nurnberger, Richard J Rose, Jaakko Kaprio
BACKGROUND: Developmental relationships between tobacco use and suicide-related behaviors (SRB) remain unclear. Our objective was to investigate the longitudinal associations of tobacco use in adolescence and SRB in adulthood. METHODS: Using a prospective design, we examined whether tobacco use in adolescence is associated with SRB (intentional self-injury, suicide ideation) in young adulthood in a population-based sample of 1330 twins (626 males, 704 females). The baseline and follow-up data were collected by professionally administered semi-structured poly-diagnostic interviews at ages 14 and 22, respectively...
December 6, 2017: Addictive Behaviors
https://www.readbyqxmd.com/read/29244996/health-seeking-behavior-and-barriers-to-care-in-patients-with-rectal-bleeding-in-nigeria
#13
Olusegun I Alatise, Sara E Fischer, Omobolaji O Ayandipo, Akinlolu G Omisore, Samuel A Olatoke, T Peter Kingham
Purpose Colorectal cancer (CRC) incidence rates are steadily increasing in Nigeria. Organized screening is still largely unused because of financial and logistical barriers; most CRCs are detected by symptoms. One symptom of CRC is rectal bleeding. This study sought to determine health-seeking behavior and barriers to care in patients with rectal bleeding in Nigeria. This study also surveyed physicians to determine major breakdowns in access to care. Methods The recruitment process for this study involved patients referred for colonoscopy because of rectal bleeding as well as response to a media advertisement for a free colonoscopy...
December 2017: Journal of Global Oncology
https://www.readbyqxmd.com/read/29244954/single-atomic-layer-ferroelectric-on-silicon
#14
Mehmet Dogan, Stephanie Fernandez-Pena, Lior Kornblum, Yichen Jia, Divine Kumah, James Reiner, Zoran Krivokapic, Alexie M Kolpak, Sohrab Ismail-Beigi, Charles Ahn, Frederick Walker
A single atomic layer of ZrO2 exhibits ferroelectric switching behavior when grown with an atomically abrupt interface on silicon. Hysteresis in capacitance-voltage measurements of a ZrO2 gate stack demonstrates that a reversible polarization of the ZrO2 interface structure couples to the carriers in the silicon. First-principles computations confirm the existence of multiple stable polarization states and the energy shift in the semiconductor electron states that result from switching between these states...
December 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/29244946/in-situ-synthetic-functionalization-of-a-transmembrane-protein-nanopore
#15
Stefan Borsley, Scott L Cockroft
Monitoring current flow through a single nanopore has proved to be a powerful technique for the in situ detection of molecular structure, binding and reactivity. Transmembrane proteins, such as α-hemolysin, provide particularly attractive platforms for nanopore sensing applications due to their atomically precise structures. However, many nanopore applications require the introduction of functional groups to tune selectivity. To date, such modifications have required genetic modification of the protein prior to functionalization...
December 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/29244866/molecular-dynamics-simulations-of-the-glucocorticoid-receptor-dna-binding-domain-suggest-a-role-of-the-lever-arm-mobility-in-transcriptional-output
#16
Lautaro Damián Álvarez, Diego Martín Presman, Adalí Pecci
One of the first and essential steps in gene expression regulation involves the recruitment of transcription factors (TFs) to specific response elements located at enhancers and/or promoters of targeted genes. These DNA elements have a certain variability in both sequence and length, which may affect the final transcriptional output. The molecular mechanisms in which TFs integrate the subtle differences within specific recognition sequences to offer different transcriptional responses is still largely unknown...
2017: PloS One
https://www.readbyqxmd.com/read/29244814/forecasting-influenza-like-illness-dynamics-for-military-populations-using-neural-networks-and-social-media
#17
Svitlana Volkova, Ellyn Ayton, Katherine Porterfield, Courtney D Corley
This work is the first to take advantage of recurrent neural networks to predict influenza-like illness (ILI) dynamics from various linguistic signals extracted from social media data. Unlike other approaches that rely on timeseries analysis of historical ILI data and the state-of-the-art machine learning models, we build and evaluate the predictive power of neural network architectures based on Long Short Term Memory (LSTMs) units capable of nowcasting (predicting in "real-time") and forecasting (predicting the future) ILI dynamics in the 2011 - 2014 influenza seasons...
2017: PloS One
https://www.readbyqxmd.com/read/29244810/synaptic-augmentation-in-a-cortical-circuit-model-reproduces-serial-dependence-in-visual-working-memory
#18
Daniel P Bliss, Mark D'Esposito
Recent work has established that visual working memory is subject to serial dependence: current information in memory blends with that from the recent past as a function of their similarity. This tuned temporal smoothing likely promotes the stability of memory in the face of noise and occlusion. Serial dependence accumulates over several seconds in memory and deteriorates with increased separation between trials. While this phenomenon has been extensively characterized in behavior, its neural mechanism is unknown...
2017: PloS One
https://www.readbyqxmd.com/read/29244799/prenatal-and-early-postnatal-measures-of-brain-development-and-childhood-sleep-patterns
#19
Desana Kocevska, Maria E Verhoeff, Selma Meinderts, Vincent W Jaddoe, Frank C Verhulst, Sabine J Roza, Maartje P C M Luijk, Henning Tiemeier
BACKGROUND: Brain development underlies maturation of sleep patterns throughout childhood. Intrauterine head growth -marker of early neurodevelopment- has not been associated with childhood sleep characteristics. We explored associations between ultrasonographic measures of prenatal and early postnatal neurodevelopment and childhood sleep. METHODS: Six-thousand-five-hundred-twenty-eight children from a population-based birth cohort (Generation R) were included. Head circumference (HC) and lateral ventricles size were assessed with mid- and late-pregnancy fetal ultrasounds, and with cranial ultrasound 3-20 weeks postnatally...
December 15, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29244778/recycling-pricing-and-coordination-of-weee-dual-channel-closed-loop-supply-chain-considering-consumers-bargaining
#20
Xiaodong Zhu, Jing Wang, Juan Tang
Environmentally friendly handling and efficient recycling of waste electrical on Waste Electrical and Electronic Equipment (WEEE) have grown to be a global social problem. As holders of WEEE, consumers have a significant effect on the recycling process. A consideration of and attention to the influence of consumer behavior in the recycling process can help achieve more effective recycling of WEEE. In this paper, we built a dual-channel closed-loop supply chain model composed of manufacturers, retailers, and network recycling platforms...
December 15, 2017: International Journal of Environmental Research and Public Health
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